The prefix "ex-" is used to indicate that someone or something is no longer in a particular role or state. For example, an "ex-husband" refers to a man who was previously married but is no longer in that relationship. This prefix can apply to various contexts, such as jobs, relationships, or titles. In addition to personal relationships, "ex-" can also describe former positions or statuses in professional settings. For instance, an "ex-employee" is someone who used to work for a company but has since left. This usage helps clarify the past status of individuals or entities.